On this day, 28 years ago, on August 6, 1997 (July 4, 1997 in the lunar calendar), a South Korean passenger plane crashed into Guam. South Korean passenger plane crash site A Korean Air Boeing 747 passenger plane flying from Seoul to Guam crashed near Guam International Airport in the early morning of August 6, 1997 local time, killing more than 200 people. At that time, there was heavy rain and harsh weather. When the plane was flying about 5 kilometers away from Guam International Airport, it suddenly disappeared from the radar screen and lost contact with the ground command tower. According to witnesses, the plane crashed into the dense forest near the airport with a mass of fire and an explosion was heard. After 17 hours of intense work, U.S. rescue workers recovered the bodies of about 70 victims from the wreckage of the South Korean passenger plane that crashed in Guam and the accident site. Korean Air said that 29 of the 254 people on board survived, including 4 crew members. The National Transportation Security Administration sent a special investigation team to the scene to investigate the cause of the accident. Two "black boxes" from the crashed passenger plane have also been found and sent to Washington for analysis. Officials from South Korea and the United States disagreed on the cause of the Korean Air plane crash. South Korea emphasized that the navigation device at Guam Airport was in a faulty state at the time, and the personnel on duty at the airport control tower were not employees of the FAA. In addition, the weather was abnormal at the time, which eventually led to the plane crash. The United States believes that the failure of the navigation device should not affect the normal landing of the aircraft, and questioned why South Korea replaced the Airbus flight flying normally on this route with a Boeing 747 charter flight that had been flying for 13 years. Boeing Aircraft Manufacturing Company says its products have an accident rate of only 1.78 parts per million. On August 10, U.S. federal investigators said they found that when the South Korean passenger plane crashed, the computer software of the radar system at Guam International Airport was malfunctioning and failed to issue a timely warning when the plane approached the ground. Under normal circumstances, when an aircraft flies close to the ground, the airport radar system will issue an alarm, and the ground commander will remind the pilot in time. However, the investigation found that due to software problems, the radar did not detect the South Korean plane approaching the ground, so the pilot did not receive a warning from the ground control tower before the plane crashed. Officials from the National Transportation Safety Board responsible for investigating the crash believe that problems with this radar system cannot be said to be the cause of the crash, but only the lack of preventive measures in one aspect. There may be many factors in the crash of the plane. In addition, the navigation system used at Guam Airport to guide the aircraft to land was discontinued long before the aircraft accident; heavy rain was falling on Guam when the aircraft approached Guam Airport. These are all possible factors for investigators to study the aircraft accident.